Mega Construx Signature Series has superior detail and more than 3500 individual components! Constructible model of Castle Grayskull that can open and shut like a book, with three storeys and six regions, including a throne chamber, command centre, dungeon, two hidden entrances, and a Jawbridge, elevator, and turrets that all operate. The Power Sword is required in order to activate drawbridge. The throne chamber is known for its famous secret passageway.

Box:

2 has packs 12-25

3 has 27-41

4 has 42-54

so roughly 75% complete and sealed.